<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>    
    .container {
        border: 1px;
    }
    .inner1 {
        margin: 10px;
        height: 10px;
        width: 10px;
        background: red;
    }
    .inner2 {
        margin: 10px;
        height: 10px;
        width: 10px;
        background: blue;
    }
    </style>
</head>
<body>
    <div class="container">
        <div class="inner1"></div>
        <div class="inner2"></div>
    </div>
</body>
</html>
